/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file           : usbd_cdc_if.c
 * @version        : v3.0_Cube
 * @brief          : Usb device for Virtual Com Port.
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2025 STMicroelectronics.
 * All rights reserved.
 *
 * This software is licensed under terms that can be found in the LICENSE file
 * in the root directory of this software component.
 * If no LICENSE file comes with this software, it is provided AS-IS.
 *
 ******************************************************************************
 */
/* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/
#include "usbd_cdc_if.h"

/* USER CODE BEGIN INCLUDE */

/* USER CODE END INCLUDE */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/

/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/
uint8_t rxbuf[8];
uint32_t relen;
/* USER CODE END PV */

/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
 * @brief Usb device library.
 * @{
 */

/** @addtogroup USBD_CDC_IF
 * @{
 */

/** @defgroup USBD_CDC_IF_Private_TypesDefinitions USBD_CDC_IF_Private_TypesDefinitions
 * @brief Private types.
 * @{
 */

/* USER CODE BEGIN PRIVATE_TYPES */

/* USER CODE END PRIVATE_TYPES */

/**
 * @}
 */

/** @defgroup USBD_CDC_IF_Private_Defines USBD_CDC_IF_Private_Defines
 * @brief Private defines.
 * @{
 */

/* USER CODE BEGIN PRIVATE_DEFINES */
/* USER CODE END PRIVATE_DEFINES */

/**
 * @}
 */

/** @defgroup USBD_CDC_IF_Private_Macros USBD_CDC_IF_Private_Macros
 * @brief Private macros.
 * @{
 */

/* USER CODE BEGIN PRIVATE_MACRO */

/* USER CODE END PRIVATE_MACRO */

/**
 * @}
 */

/** @defgroup USBD_CDC_IF_Private_Variables USBD_CDC_IF_Private_Variables
 * @brief Private variables.
 * @{
 */
/* Create buffer for reception and transmission           */
/* It's up to user to redefine and/or remove those define */
/** Received data over USB are stored in this buffer      */
uint8_t UserRxBufferFS[APP_RX_DATA_SIZE];

/** Data to send over USB CDC are stored in this buffer   */
uint8_t UserTxBufferFS[APP_TX_DATA_SIZE];

/* USER CODE BEGIN PRIVATE_VARIABLES */

/* USER CODE END PRIVATE_VARIABLES */

/**
 * @}
 */

/** @defgroup USBD_CDC_IF_Exported_Variables USBD_CDC_IF_Exported_Variables
 * @brief Public variables.
 * @{
 */

extern USBD_HandleTypeDef hUsbDeviceFS;

/* USER CODE BEGIN EXPORTED_VARIABLES */

/* USER CODE END EXPORTED_VARIABLES */

/**
 * @}
 */

/** @defgroup USBD_CDC_IF_Private_FunctionPrototypes USBD_CDC_IF_Private_FunctionPrototypes
 * @brief Private functions declaration.
 * @{
 */

static int8_t CDC_Init_FS(void);
static int8_t CDC_DeInit_FS(void);
static int8_t CDC_Control_FS(uint8_t cmd, uint8_t *pbuf, uint16_t length);
static int8_t CDC_Receive_FS(uint8_t *pbuf, uint32_t *Len);
static int8_t CDC_TransmitCplt_FS(uint8_t *pbuf, uint32_t *Len, uint8_t epnum);

/* USER CODE BEGIN PRIVATE_FUNCTIONS_DECLARATION */

/* USER CODE END PRIVATE_FUNCTIONS_DECLARATION */

/**
 * @}
 */

USBD_CDC_ItfTypeDef USBD_Interface_fops_FS = {CDC_Init_FS, CDC_DeInit_FS, CDC_Control_FS, CDC_Receive_FS, CDC_TransmitCplt_FS};

/* Private functions ---------------------------------------------------------*/
/**
 * @brief  Initializes the CDC media low layer over the FS USB IP
 * @retval USBD_OK if all operations are OK else USBD_FAIL
 */
static int8_t CDC_Init_FS(void)
{
  /* USER CODE BEGIN 3 */
  /* Set Application Buffers */
  USBD_CDC_SetTxBuffer(&hUsbDeviceFS, UserTxBufferFS, 0);
  USBD_CDC_SetRxBuffer(&hUsbDeviceFS, UserRxBufferFS);
  return (USBD_OK);
  /* USER CODE END 3 */
}

/**
 * @brief  DeInitializes the CDC media low layer
 * @retval USBD_OK if all operations are OK else USBD_FAIL
 */
static int8_t CDC_DeInit_FS(void)
{
  /* USER CODE BEGIN 4 */
  return (USBD_OK);
  /* USER CODE END 4 */
}

/**
 * @brief  Manage the CDC class requests
 * @param  cmd: Command code
 * @param  pbuf: Buffer containing command data (request parameters)
 * @param  length: Number of data to be sent (in bytes)
 * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
 */
static int8_t CDC_Control_FS(uint8_t cmd, uint8_t *pbuf, uint16_t length)
{
  /* USER CODE BEGIN 5 */
  switch(cmd)
  {
    case CDC_SEND_ENCAPSULATED_COMMAND: break;

    case CDC_GET_ENCAPSULATED_RESPONSE: break;

    case CDC_SET_COMM_FEATURE: break;

    case CDC_GET_COMM_FEATURE: break;

    case CDC_CLEAR_COMM_FEATURE:

      break;

      /*******************************************************************************/
      /* Line Coding Structure                                                       */
      /*-----------------------------------------------------------------------------*/
      /* Offset | Field       | Size | Value  | Description                          */
      /* 0      | dwDTERate   |   4  | Number |Data terminal rate, in bits per second*/
      /* 4      | bCharFormat |   1  | Number | Stop bits                            */
      /*                                        0 - 1 Stop bit                       */
      /*                                        1 - 1.5 Stop bits                    */
      /*                                        2 - 2 Stop bits                      */
      /* 5      | bParityType |  1   | Number | Parity                               */
      /*                                        0 - None                             */
      /*                                        1 - Odd                              */
      /*                                        2 - Even                             */
      /*                                        3 - Mark                             */
      /*                                        4 - Space                            */
      /* 6      | bDataBits  |   1   | Number Data bits (5, 6, 7, 8 or 16).          */
      /*******************************************************************************/
    case CDC_SET_LINE_CODING: break;

    case CDC_GET_LINE_CODING: break;

    case CDC_SET_CONTROL_LINE_STATE: break;

    case CDC_SEND_BREAK: break;

    default: break;
  }

  return (USBD_OK);
  /* USER CODE END 5 */
}

/**
 * @brief  Data received over USB OUT endpoint are sent over CDC interface
 *         through this function.
 *
 *         @note
 *         This function will issue a NAK packet on any OUT packet received on
 *         USB endpoint until exiting this function. If you exit this function
 *         before transfer is complete on CDC interface (ie. using DMA controller)
 *         it will result in receiving more data while previous ones are still
 *         not sent.
 *
 * @param  Buf: Buffer of data to be received
 * @param  Len: Number of data received (in bytes)
 * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
 */
static int8_t CDC_Receive_FS(uint8_t *Buf, uint32_t *Len)
{
  /* USER CODE BEGIN 6 */
  relen = Len[0];
  for(uint16_t i = 0; i < relen; i++)
  {
    rxbuf[i] = Buf[i];
  }
  USBD_CDC_SetRxBuffer(&hUsbDeviceFS, &Buf[0]);
  USBD_CDC_ReceivePacket(&hUsbDeviceFS);
  return (USBD_OK);
  /* USER CODE END 6 */
}

/**
 * @brief  CDC_Transmit_FS
 *         Data to send over USB IN endpoint are sent over CDC interface
 *         through this function.
 *         @note
 *
 *
 * @param  Buf: Buffer of data to be sent
 * @param  Len: Number of data to be sent (in bytes)
 * @retval USBD_OK if all operations are OK else USBD_FAIL or USBD_BUSY
 */
uint8_t CDC_Transmit_FS(uint8_t *Buf, uint16_t Len)
{
  uint8_t result = USBD_OK;
  /* USER CODE BEGIN 7 */
  USBD_CDC_HandleTypeDef *hcdc = (USBD_CDC_HandleTypeDef *)hUsbDeviceFS.pClassData;
  if(hcdc->TxState != 0)
  {
    return USBD_BUSY;
  }
  USBD_CDC_SetTxBuffer(&hUsbDeviceFS, Buf, Len);
  result = USBD_CDC_TransmitPacket(&hUsbDeviceFS);
  /* USER CODE END 7 */
  return result;
}

/**
 * @brief  CDC_TransmitCplt_FS
 *         Data transmitted callback
 *
 *         @note
 *         This function is IN transfer complete callback used to inform user that
 *         the submitted Data is successfully sent over USB.
 *
 * @param  Buf: Buffer of data to be received
 * @param  Len: Number of data received (in bytes)
 * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
 */
static int8_t CDC_TransmitCplt_FS(uint8_t *Buf, uint32_t *Len, uint8_t epnum)
{
  uint8_t result = USBD_OK;
  /* USER CODE BEGIN 13 */
  UNUSED(Buf);
  UNUSED(Len);
  UNUSED(epnum);
  /* USER CODE END 13 */
  return result;
}

/* USER CODE BEGIN PRIVATE_FUNCTIONS_IMPLEMENTATION */
unsigned char usbtemp[64];
void usbvcom_printf(const char *format, ...)
{
  unsigned short len;
  va_list args;
  va_start(args, format);
  len = vsnprintf((char *)usbtemp, sizeof(usbtemp) + 1, (char *)format, args);
  va_end(args);
  CDC_Transmit_FS(usbtemp, len);
}

/* USER CODE END PRIVATE_FUNCTIONS_IMPLEMENTATION */

/**
 * @}
 */

/**
 * @}
 */
